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| a long time with little or no rain |
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| to tame plants and animals for people's use |
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| domesticated animlas such as cattle, sheep, and pigs |
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| thedomestication of plants and animals |
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| cutting and burning forest lands to gain new farmland |
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| flat areas built on slopes |
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| the use of connected ditches, canals, dams, and dikes to move water to dry areas |
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| the exchange of one good or service for another |
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| a centralized society with developed forms of religion, ways of governing, and learning |
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| a long cold weather period when huge sheets of ice covered part of the Earth's surface |
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| a person with no settled home |
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| weather conditions of a region |
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| money paid to the government |
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| tool to cut, lift, and turn soils |
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| members of a group do different tasks |
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| a system used to make laws and decisions |
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| a person who buys and sells goods |
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| a group that has a specific level of importance in society |
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